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An object is placed at 20 cm in front of a concave mirror and the image is formed at a distance of 30 cm from the mirror, find the focal length of the mirror. - एक वस्तु अवतल दर्पण के सामने 20 सेमी पर रखी है और प्रतिबिंब दर्पण से 30 सेमी की दूरी पर बनता है। दर्पण की फोकस दूरी ज्ञात करें−

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An object is placed at 20 cm in front of a concave mirror and the image is formed at a distance of 30 cm from the mirror, find the focal length of the mirror. - एक वस्तु अवतल दर्पण के सामने 20 सेमी पर रखी है और प्रतिबिंब दर्पण से 30 सेमी की दूरी पर बनता है। दर्पण की फोकस दूरी ज्ञात करें−






 
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